I am now working in IBM, engaged in mainframe development, using cobol+db2+jcl+cics and so on. Your question actually depends on the individual. I have average talent, average learning ability and average enthusiasm. However, it is quite handy to learn what you are interested in. Even if I study lazily, I can learn well and use it accurately, all by interest! Yes, yes, interest! Cobol is not difficult, just a simple English sentence patchwork, plus a little grammar of the language itself. Let me tell you this, it's simpler than Java and simpler than C. Of course, getting started is easier than mastering. It is unprofessional of you to ask this question. The real professional question should be what is the proportion of cobol in mainframe development and what technologies should be paid attention to. In this case, the topic will be wide. My answer is, summarize and then summarize, accumulation is TMD accumulation, understand? Now let's take a look at cobol's programming, understand the grammar, get familiar with the process, and then check it with the project. Don't panic. I have been developing cobol for three years, almost four years now, but if I really ask this question, it won't take ten days! ! ! !